travel0er的专栏

double CalculateDewPoint(double temp, int humidity){ if (humidity==0) return temp; double dew_numer = 243.04*(log(double(humidity)/100.0)+((17.625*temp)/(temp+243.04))); double dew_denom = 17.6...

timeval - timeval定义struct timeval{time_t tv_sec;  /*seconds, 秒*/suseconds tv_usec; /*microseconds, 微秒*/}timeval表示一个时间点，用秒、微秒来定义时间点

第一章安装安装虚拟环境 基于python2.7 sudo apt-get install python-virtualenv$ git clone https://github.com/miguelgrinberg/flasky.git $ cd flasky $ git checkout 1a $ virtualenv venv 激活虚拟环境 sourc